Two Rod and Valve Gear Questions

[NW Mailing List]

One answer was posted to this, and then the tread transitioned into other
areas.  I have waited hoping someone else would comment about Abram's
question (1), but it hasn't happened, so I shall.

Abram's parenthetical decision that the answer has to be "yes",  the
distance from center of axle to center of main driving crank pin is
one-half the piston stroke, is correct, and it's true fro any driver
diameter.  Mental logic said he was right, a freehand sketch said he was
right, and calling up from the NWHS web site the drawings for the main
driver on the J and the main driver on the Y3 through Y6b verified it - 16
in. in all cases for a 32 in. piston stroke.

Regards,

Dave Phelps

On Mon, Aug 6, 2018 at 6:35 AM NW Mailing List <nw-mailing-list at nwhs.org>
wrote:

>
> Hopefully there will be some talent left around which can give an answer
> to these two humble little questions...
>
>
> (1)  Is there always a mathematical ratio of 2:1 between (a) the distance
> from center of axle to center of main driving crank pin, on the one hand,
> and (b) the length of the stroke of the piston, on the other hand?  (Prima
> facie, this sounds like a really, really dumb question... sorry.)
>
>
> (2)  In quartering drivers on axles, how far in degrees is one driver
> advanced beyond perfect quarter, to insure that the engine will never be
> caught on dead-center?  (And I believe N&W used right-hand lead, contrary
> to most American practice, did they not?  If so, I wonder where that
> practice came from?)
>
>
> --  abram burnett,
> (who should probably just stick to turnip farming...)
>
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